Read: https://www.theweathernetwork.com/ca/news/article/nasa-says-asteroid-will-hit-earth-eventually-heres-how-we-protect-ourselves
?bypass-service-worker&20190430122954
I read some about that and it's a real threat but not one we can really prevent. Those that think they can need to do some more work and accept the inevitable.
I think the technological capability exists to deflect or destroy an asteroid at least as large as the one that caused the Cretaceous extinction 65 million years ago. But it would take about 5 years and a lot of money to prepare such a system for use.
https://en.m.wikipedia.org/wiki/Asteroid_impact_avoidance
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